cd4047

I am looking to have a period of say 60secs, and within that 60 secs a pulse of 20khz square wave for 20 secs. That pulse of 20 secs can be anywhere within that 60 secs. And then repeated. I am lead to believe 3 x CD4047 can do it ( a bit like using 2 x NE555) but I cannot find anybody doing...

I am building this solar powered inverter: https://ibb.co/58m5L8B using a 12V, 0.8 Ah battery as the input source and a CD4047 IC for the inverter. However, the resistors connected to pin 2 are rated at 0.5W and the IC has a maximum power dissipation of 500 mW. I want to keep the efficiency of...